2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $100,000 $200,000 $300,000 $400,000 $500,000 $600,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $241,810 | 56,300 | 104,357 |
| 2006 | $242,219 | 34,770 | 104,534 |
| 2007 | $173,357 | 21,569 | 73,956 |
| 2008 | $364,925 | 55,246 | 122,647 |
| 2009 | $427,406 | 74,895 | 120,015 |
| 2010 | $420,689 | 80,849 | 114,434 |
| 2011 | $536,631 | 102,133 | 178,059 |
Note: Quantity represents Number of pairs
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